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排序方式: 共有349条查询结果,搜索用时 8 毫秒
341.
Kim DH Lu N Ghaffari R Kim YS Lee SP Xu L Wu J Kim RH Song J Liu Z Viventi J de Graff B Elolampi B Mansour M Slepian MJ Hwang S Moss JD Won SM Huang Y Litt B Rogers JA 《Nature materials》2011,10(4):316-323
Developing advanced surgical tools for minimally invasive procedures represents an activity of central importance to improving human health. A key challenge is in establishing biocompatible interfaces between the classes of semiconductor device and sensor technologies that might be most useful in this context and the soft, curvilinear surfaces of the body. This paper describes a solution based on materials that integrate directly with the thin elastic membranes of otherwise conventional balloon catheters, to provide diverse, multimodal functionality suitable for clinical use. As examples, we present sensors for measuring temperature, flow, tactile, optical and electrophysiological data, together with radiofrequency electrodes for controlled, local ablation of tissue. Use of such 'instrumented' balloon catheters in live animal models illustrates their operation, as well as their specific utility in cardiac ablation therapy. The same concepts can be applied to other substrates of interest, such as surgical gloves. 相似文献
342.
The effect of gamma-irradiation and maize lipids on aflatoxin B1 production by Aspergillus flavus artificially inoculated into sterilized maize at reduced water activity (aw 0.84) was investigated. By increasing the irradiation doses the total viable population of A. flavus decreased and the fungus was completely inhibited at 3.0 kGy. The amounts of aflatoxin B1 were enhanced at irradiation dose levels 1.0 and 1.5 kGy in both full-fat maize (FM) and defatted maize (DM) media and no aflatoxin B1 production at 3.0 kGy gamma-irradiation over 45 days of storage was observed. The level in free lipids of FM decreased gradually, whereas free fatty acid values and fungal lipase activity increased markedly by increasing the storage periods. The free fatty acid values decreased by increasing the irradiation dose levels and there was a significant enhancement of fungal lipase activity at doses of 1.0 and 1.50 kGy. The ability of A. flavus to grow at aw 0.84 and produce aflatoxin B1 is related to the lipid composition of maize. The enhancement of aflatoxin B1 at low doses was correlated to the enhancement of fungal lipase activity. 相似文献
343.
Lefouili Moussa Kamel Kerroum Khalil El Khamlichi Drissi 《International Journal of Numerical Modelling》2011,24(5):496-506
This study gives an original way to have a rapid idea of the position of the located defects on grounding systems. For determining electromagnetic fields' radiation, we use an easy method, based on analytical formula, transmission line theory, and modified images theory, instead of complex method of Summerfield's integrals. The cartography of the electromagnetic fields radiated at the soil—air interface, by energized grounding systems (electrode or grid), can be used to detect and localize a defect on these systems. This model is aimed at helping in electromagnetic compatibility and lightning protection studies. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
344.
Omar Moussa Anastasios P. Vassilopoulos Julia de Castro Thomas Keller 《应用聚合物科学杂志》2013,127(4):2490-2496
The long‐term changes in the thermophysical and mechanical properties of a cold‐curing structural epoxy adhesive were investigated by accelerating the curing reaction by post‐curing at elevated temperatures. Experimental data concerning the glass transition temperature for periods of up to 7 years and tensile strength and stiffness measurements could be extrapolated for a period of up to 17 years. An existing model for the long‐term development of concrete properties was modified for the prediction of the long‐term mechanical properties of adhesives. The applicability of the acceleration procedure and the new model was confirmed by several verification procedures. Structural adhesives exhibit significant increases in glass transition temperature, strength and stiffness over the long term provided that joints are adequately sealed and protected from humidity and UV radiation. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 相似文献
345.
Silicon - The aim of this work is to invent a novel technology for manufacture not only graphene oxide, but also conductive graphene oxide. This is the novelty in this technology, which is not... 相似文献
346.
Eliane Dahdah Jane Estephane Lena Moussa Chalouhi Safa Sammoury Bilal El Khoury Cedric Gennequin Edmond Abi-Aad Samer Aouad 《化学工程与技术》2022,45(1):51-57
The production of biodiesel from refined sunflower vegetable oil over basic CaO/ZSM-5 catalysts was investigated. Several catalysts with various loadings of CaO on ZSM-5 were prepared, calcined at 800 °C, and characterized by N2 adsorption-desorption, X-ray diffraction, Fourier transform infrared spectroscopy, and CO2-temperature-programmed desorption techniques. Calcined catalysts were tested in the transesterification reaction and reaction conditions were optimized by varying the catalyst-to-oil ratio and reaction time. The most active catalyst was the CaO/ZSM-5 catalyst with a 35 wt % loading which gave the highest fatty acid methyl ester yield. The high catalytic activity was attributed to the active basic sites generated following CaO addition. Furthermore, the catalyst demonstrated stability against the leaching process. 相似文献
347.
Vincent Polewczyk Moussa Mezhoud Martando Rath Oualyd El-Khaloufi Ferdinando Bassato Arnaud Fouchet Wilfrid Prellier Mathieu Frégnaux Damien Aureau Luca Braglia Giovanni Vinai Piero Torelli Ulrike Lüders 《Advanced functional materials》2023,33(31):2301056
In the search of low cost and more efficient electronic devices, here the properties of SrVO3 transparent conductor oxide (TCO) thin film are investigated, both visible-range optically transparent and highly conductive, it stands as a promising candidate to substitute the standard indium-tin-oxide (ITO) in applications. Its surface stability under water (both liquid and vapor) and other gaseous atmospheres is especially addressed. Through the use of spectroscopy characterizations, X-ray photoemission and operando X-ray absorption measurements, the formation of a thin Sr-rich V5+ layer located at the surface of the polycrystalline SrVO3 film with aging is observed, and for the first time how it can be removed from the surface by solvating in water atmosphere. The surface recovery is associated to an etching process, here spectroscopically characterized in operando conditions, allowing to follow the stoichiometric modification under reaction. Once exposed in oxygen atmosphere, the Sr-rich V5+ layer forms again. The findings improve the understanding of aging effects in perovskite oxides, allowing for the development of functionalized films in which it is possible to control or to avoid an insulating surface layer. This constitutes an important step towards the large-scale use of V-based TCOs, with possible implementations in oxide-based electronics. 相似文献
348.
Mohamed B. El Mashade Abdel Aty Moussa 《电子科学学刊(英文版)》1998,15(4):302-313
This poaper is devoted to the performance evaluation of the Generalized Sigu(GS). Trimmed Generalized Sign(TGS), Modified Savage(MS). Mann-Whitney(MW) and a new proposed detector in multiple target situations. The analysis is carried out for both fluctuating and nonfluctuating received signals. The simulation results show that the new proposed detector has the best detection performance in homogeneous as well as nonhomogeneous background conditions, while TGS procedure is better than the GS detector in distinguishing the primary target from the secondary interfering ones. 相似文献
349.
H. Volders Z. Tökei B. Brijs L. Carbonell C. Drijbooms S. Garaud A. Moussa Y. Travaly G. Vereecke W.-M. Li A.M. Jonas 《Microelectronic Engineering》2007,84(11):2460-2465
A ternary WNxCy system was deposited in a thermal ALD (atomic layer deposition) reactor from ASM at 300 °C in a process sequence using tungsten hexafluoride (WF6), triethyl borane (TEB) and ammonia (NH3) as precursors. The WCx layers were deposited by a novel ALD process at a process temperature of 250 °C. The WNx layers were deposited at 375 °C using bis(tert-butylimido)-bis-(dimethylamido)tungsten (tBuN)2(Me2N)2W (imido-amido) and NH3 as precursors. WNx grows faster on plasma enhanced chemical vapor deposition (PECVD) oxide than WCx does on chemical oxide. WNxCy grows better on PECVD oxide than on thermal oxide, which is opposite of what is seen for WNx. In the case of the ternary WNxCy system, the scalability towards thinner layers and galvanic corrosion behavior are disadvantages for the incorporation of the layer into Cu interconnects. ALD WCx based barriers have a low resistivity, but galvanic corrosion in a model slurry solution of 15% peroxide (H2O2) is a potential problem. Higher resistivity values are determined for the binary WNx layers. WNx shows a constant composition and density throughout the layer. 相似文献